Electric motor.



No. 731,857. PATENTED JUNE 23, 1903.

P. E. CHAPMAN.

ELEGTRIG' MOTOR.

APPLICATION PILBD'SEPT. 15, 1902.

3 SHEETSSHBET 1.

N0 MODEL.

I l llllllh my I PATENTED JUNE 23, 1903., v

3 SHEETS-S11E31 2.

P. E. CHAPMAN. ELECTRIC MOTOR. APPLIOATION FILED SEPT. 15, 1902 H0MODEL.

(Zap

Q u m No. 731,857. PATENTED JUNE 23, 1903.. P. E. CHAPMAN. BLEGTRIGMOTOR.

APPLIGATION FILED SEPT. 15' 1902. K0 MGDEL. v 3 SHEETS-SHEET 3.,

UNITED STATES Patented June 23, 1903.

PATENT OFFICE.

PENROSE E. CHAPMAN, OF ST. LOUIS, MISSOURI, ASSIGNOR TO UNIVERSALACCOUNTANT MACHINE COMPANY, OF ST. LOUIS, MISSOURI, A CORPO- RATION OFMISSOURI.

ELECTRIC MOTOR.

SPECIFICATION forming part of Letters Patent- N 0. 731,857, dated June23, 1903. Application filed September 15, 1902. Serial No. 123,450.- (Nomodel.)

T (6 whom it may concern:

Be it known that I, PENROSE E. CHAPMAN, a citizen of the United States,residing at St. Louis, Missouri, have invented a certain new and usefulImprovement in Electric Motors, of which the following is a full, clear,and exact description, such as will enable'others skilled in the art towhich it appertains to make and use the same, reference being had to tothe accompanying drawings, forming part of this specification, in Which-Figure l is a horizontal sectional view on the line 1 1 of Fig. 2. Fig.2 isafront elevational view, partly in section. Fig. 3 isa verticalsectional view on the line 3 3 of Fig. 2.

Fig. 4: is a diagrammatic view of the armature and its windings, andFig. 5 is a side elevational view of a cabinet-frame containing a motorconnected to an adding-machine resting on said cabinetframe.

This invention relates to a new and useful improvement in electricmotors of that type where the armature is designed to make less than acomplete revolution at each operation,

means being provided for restoring the armatu re to home or startingposition in readiness for another operation. The motor shown in theaccompanying drawings is designed particularly for use in driving themain shaft of shown in the United States patent granted to Frank C.Rinsche July 2%, 1900, No. 654,181.

In Fig. 5 I have shown a calculating-machine parlly broken away, whichmachine is placed on a cabinet and provided with a sprocket-wheel on theshaft which usually carries the operating-handle. My improved motor isarranged in the cabinet, and a sprocket-wheel is mounted on itsarmatureshaft, the two sprockets being connected by an appropriatechain, whereby when the motor is energized through the said connectionthe calculating-machine is driven forwardly. The restoring-springs inthe machine are used 5 to return the armature after actuation. It isobvious, however, that instead of gearing the motor to thecalculating-machine the same can be coupled directly to thedriving-shaft thereof, the motor-frame being bolted or aracalculating-machine--such, for instance, as

ranged upon a suitable bracket extending from the frame.

l/vhile I have shown the motor as connected to a calculating-machine,such connection is shown merely as a convenience, because such machineshave therein means 5 which will restore the armature to its normalposition after the current is interrupted, though it is obvious that themotor is equally applicable to any machine requiring the same movementand containing restoring means for the armature.

In the drawings, 1 indicates the frame of the motor, preferably in theform of steel casting and provided with lugs 2, forming supporting-feet,which lugs are preferably per- 6 forated for the passage ofsecuring-screws.

3 indicates the poles extending from the frame.

4 and 5 are the front and back plates, which are bolted to the frame,said plates being pro- 0 vided with openings to receive bushings 6 ofself-alining bearings forthe armature-shaft.

7indicates the armatu re-shaft, upon which are arranged larninationsforming the armature. 7

8 indicates the collector-rings, mounted upon the armature-shaftandcooperating with brushes 9 and 10, through which a current is led to andfrom the windings on the armature l1. 8o

12 indicates the field-magnet winding.

The armature-winding, as shown in Fig. 4, is of that type known aspyramidal Winding-that is, the laminations forming the armature-core areformed with teeth, and in winding the armature one of these teeth isfirst Wound, after which the winding includes the next two teeth, thenthe next adjacent two teeth, and so on until one-half of said teeth areincluded in the winding to form one pole on the armature. By this methodof winding, which is duplicated on the opposite side, the armature hastwo poles whose greatest magnetic intensity is located at diametricallyopposite points on the periphery thereof, approximately opposite theteeth first wound. In the normal position of the armature with referenceto the field-poles the center of each armature-pole is preferably to oneside of a Vertical line through the armatureshaft perpendicular to themagnetic axis of the field-magnets. Thus when current is ad.- mitted tothe field and armature windings the first magnetic action of thearmature is repulsion, combined with attraction toward the oppositefield-poles, followed by increasing attraction and decreasing repulsionup to the point where the armature-poles aline with the field-poles,imparting an available movement to the armature slightly in excess ofonequarter of a turn. In other words, there is a tendency to turn thearmature similar to that in any direct-current motor; but in myinvention, there being no commutator, the action is from zero to maximumand .to zero again as the center of the armature passes the successivepoints.

There being no commutators, it is obvious that no sparking can occurinthe motor, that when the centers of the armature-poles aline with afield-pole the armature will come to a position of rest, maintainingsuch position until current is out off from the machine, and that whenthe motor is denergized the armature is free to return to its originalposition in readiness for another operation. When the motor is connectedwith an addingmachine, as shown in Fig. 5, the returnspring 15, which isconnected atone end there of to a fixed member 16 of the machine and atits opposite end to the cam or lever 17 by means of the chain 18, willretract said camlever, which is secured to the sprocket 19 on theactuating-shaft of said machine, thereby restoring said machine, andthrough the sprockets and chain the motor is returned to its normalposition of rest. The construction is extremely simple, the parts beingeasy of assemblage, and the brushes bearing upon collector rings whichdo no not spark will wear a long time without renewing.

In practice a direct-current is used for energizing my improved motor,and so far as I am aware I am the first to employ a pyramidally-woundarmature which is energized by a direct current.

tion the winding may be secured with a minimum quantity of wire, and theresistance is consequently less and efficiency higher than By the use ofmy inventhe ordinary directcurrent winding, the winding used in myarmature being one where the maximum efficiency can be obtained for thistype of motor.

The circuit is as follows: through leader 20 into piston-rod 21 ofdash-pot 22, wherein the circuit is broken upon elevation of piston-rod21 and closed upon depression thereof through the key 22. From thedash-pot the circuit continues to the post 23, where it is dividedbetween the field and the armature and continues thence to post 24 andline 25 to its source.

I am aware that many minor changes in the construction, arrangement, andcombination of the several parts of my device can be made andsubstituted for those herein shown and described without in the leastdeparting from the nature and principle of my invention.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

1. In an electric motor of the character described, the combination withfield-magnets, and a pyramidally-wound armature which is incapable ofmaking a complete revolution when the field-magnets are energized;substantially as described.

2. In a motor of the character described, the combination with a framehaving fieldpoles, of a laminated armature, pyramidal windings on saidarmature, and means for simultaneously energizing the field andpyramidal windings of the armature; substantially as described.

3. In a motor of the character described, the combination with a framehaving poles, of windings arranged on said poles, an armature havingteeth, pyramidal windings on the teeth of said armature, collector-ringsforming the terminals of said armature-windings, and brushes cooperatingwit-h said collectorrings; substantially as described.

In testimony whereof I hereunto affix my signature, in the presence oftwo witnesses, this 10th day of September, 1902.

PENROSE E. CHAPMAN.

Witnesses:

GEORGE BAKEWELL, G. A. PENNINGTON.

